Thompson & Morgan Cosmos Bipinnatus Xanthos - 1 Seed Packet (200 Seeds)
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The Thompson & Morgan Cosmos Bipinnatus 'Xanthos' is an ideal choice for gardeners seeking a compact, reliable, and early-flowering plant that provides a soft yellow aesthetic to borders and containers. This variety is perfect for both novice and experienced gardeners who want quick results, with blooms typically appearing within 70 days of sowing; however, gardeners must be careful to wait until all risk of frost has passed before moving plants to their permanent outdoor location.
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| Brand | Thompson & Morgan |
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FAQs
How long until I see flowers?
You can expect to see the first blooms approximately 70 days after sowing.
Can I grow these in pots?
Yes, their compact habit makes them well-suited for container gardening as long as the pot has adequate drainage.
Do I need to fertilize them?
Cosmos are generally unfussy, but a balanced liquid fertilizer can be used sparingly if the soil is particularly poor.
What is the best way to deadhead?
Snip off the flower head just above the first set of leaves below the bloom once the petals begin to fade.
Is it safe to plant these in early spring?
No, you must wait until all risk of frost has completely passed in your local area.
How many seeds are in the packet?
The packet contains 200 seeds.
Troubleshooting
Seeds failing to germinate
Ensure the soil temperature is consistently between 20-25°C and that the seeds are exposed to light, as buried seeds may fail to emerge.
Leggy or weak stems
This is often caused by insufficient light. Ensure seedlings are placed in a sunny windowsill or greenhouse bench.
Plants wilting after transplant
Ensure a proper hardening-off period and ensure the root ball is moist during the transplanting process.
Pros and Cons
Pros
- Exceptionally early blooming period
- Compact size fits various garden configurations
- High volume of seeds per packet
- Unique color variety compared to standard pink or white cosmos
Cons
- Sensitive to frost damage
- Requires careful hardening off before outdoor planting
- Needs consistent deadheading to maintain peak bloom production
Setup, Compatibility & Care
To begin, sow seeds in high-quality, free-draining seed compost. Keep the tray in a warm environment between 20-25°C (68-77°F) with access to light, as light is a trigger for germination. Once seedlings reach a handleable size, transplant them to 7.5cm pots.
Before moving your plants to their permanent home, you must 'harden them off'—a process of gradually exposing the plants to outdoor temperatures over a two-week period. Once established outdoors, space plants at least 45cm apart to ensure adequate airflow. Water them regularly, particularly during dry spells, and remember to remove spent blooms (deadhead) to prevent the plant from diverting energy into seed production, which keeps the flowering season long and vibrant.